This is a great question.
I have recently found XCN and now mine (thanks gang for the AMD miner ) because I think the "mini blockchain" is a great innovation (as well as tx malleability and withdrawal limits). I think of how to answer your question. If and only IF XCN's mini chain could be applicable to ALL coins in the teleporting network - that's value added. An a non-technical (non-coder) person, I don't know how this can be done. However, I do know jl777's vision is to integrate a "dark" network with all the best features of alts.
The four coins now part of the core are BTCD (teleport tech), BBR (onion routing for anon entry into teleport), VCN (fiat <--> coin conversion), and of course NXT for his other tech: privacybet, instadex, mgw, etc. Now, if the XCN tech of miniblockchain could be added to these ideal technologies/BTC improvements, then of course this would be huge for supernet.
I ramble and do not answer your question: smarter people than I need to explain this possibility. But I agree that XCN could improve greatly the supernet, whatever it is or will be...
Edit: is it too much to ask bitfreak! to ask james via PM about this possibility? Last I read, bitfreak! was against an integration idea...is this true?
Edit 2: maybe the supernet is seen by devs as "greed driven trend" as explained in the OP?
Edit 3: just found this post...
Supernetwork IPO on Poloniex
https://bitcointalksearch.org/topic/m.8592943
So maybe it's more about supernet currently being vaporware. Are you certain about this double spend issue?
[me]...continuing to read this tread[/me]